Construction of opt-magnetic nano materials by Programmable DNA self-organization

DNA是生命科学中最重要的材料，也是一种天然存在的具有高度特异性功能的生物聚合物。DNA有望成为“自下而上”制造无机和生物有机分子器件的结构基础。采用自组装技术，在云母衬底上构建了Au纳米粒子/DNA、铁磁性Co纳米粒子，在Al_2O_3（0001）单晶衬底表面沿单层台阶形成了纳米粒子/DNA网络的一维直线。采用点接触成像(PCI)-AFM技术揭示了DNA网络的纳米级电导率，并报道了DNA电导率与湿度的关系，提示离子导电。我们开发的原子力显微镜纳米光刻技术，被用于构建复杂氧化物的纳米结构，其尺寸小至30 nm，具有高居里温度，完美的自旋极化和生物分子的高稳定性。我们实现了（La,Ba）MnO_3和新的铁磁氧化物（Fe,Mn）_3O_4纳米间隙电极结构，并在其中成功形成了DNA和Au纳米粒子自组装的纳米结构。

DNA is the most important material in life science, and can also be regarded as a naturally occurring and highly specific functional biopolymer. DNA shows promise as a provider of a structural basis for the "bottom-up" fabrication of inorganic and bio-organic molecular devices.DNA and nano-particle complex networks were constructed by self assembly technique, such as Au nano-particle/DNA, ferromagnetic Co nano particle on mica substrate, and straight one dimensional lines of nano-particle/DNA network along mono-layer step on Al_2O_3(0001) single crystal substrate surface.Point Contact Imaging (PCI)-AFM technique was, developed to reveal nano scale conductivity of DNA network, and dependence of DNA conductivity on humidity was reported suggesting ionic conduction.Atomic Force Microscope nano-lithography we have developed, was used to construct robust nano-structures of complex oxides down to 30 nm in size, which exhibit High Curie temperature, perfect spin polarization, and high stability for biological molecules.We have realized (La,Ba)MnO_3 and new ferromagnetic oxide (Fe,Mn)_3O_4 nano-gap electrode structures and successful formation of DNA and Au nano-particle self assembled nano structure within them.